Originally Posted by
galaxy flyer
Actually, the prelim says the parking handle and valve were positioned in the set position. They doesn’t specifically mean the brake was set. They had sub-standard acceleration, but reached 100 knots on the runway.
Doesn't the parking brake valve just trap pressure in the normal brake line? So it's possible the handle was set with light brake application and the aircraft can still be moved. Other forums have had posters who espoused the idea that with partial brake application on the TO roll the application becomes stronger as the brakes heat up explaining the skid marks. N91GY will probably be the same thing and one wonders if a warning should have been given by FAA/Cessna although I would think the parking brake would be on the TO checklist since it was not part of the TO warning system.